Table 3. BE and Percentual Atomic Concentration (at. %) Obtained from XPS Data for the Three HPC Samples.
| HPC-1 |
HPC-2 |
HPC-3 |
|||||
|---|---|---|---|---|---|---|---|
| level | BE (eV) | at. % | BE (eV) | at. % | BE (eV) | at. % | binding type |
| C 1s | 284.8 | 72.2 | 284.8 | 70.6 | 284.7 | 72.7 | C–C/C–Hx |
| 286.6 | 11.6 | 286.5 | 11.3 | 286.5 | 11.9 | C–OH | |
| 288.9 | 4.3 | 288.9 | 6.1 | 288.9 | 4.2 | O=C–OH | |
| O 1s | 530.7 | 3.5 | 530.7 | 0.9 | 530.3 | 1.3 | O-metal |
| 532.2 | 5.4 | 532.2 | 4.9 | 532.2 | 7.1 | OH– | |
| 533.3 | 0.6 | 533.7 | 4.1 | 533.7 | 2.0 | O=C– | |
| Pd 3d5/2 | 335.5 | 0.6 | 335.4 | 0.6 | 335.6 | 0.2 | Pd–Pd (Pd0) |
| 336.4 | 0.2 | 336.3 | 0.2 | 337.0 | 0.1 | Pd–O (Pd2+) | |
| Pt 4f7/2 | 71.4 | 1.4 | 71.2 | 1.0 | 71.5 | 0.5 | Pt–Pt (Pt0) |
| 72.6 | 0.3 | 72.4 | 0.3 | 72.9 | 0.1 | Pt–OH (Pt2+) | |